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CASSEM meeting – EADS Paris. Active Structures Laboratory www.ulb.ac.be/scmero. Arnaud Deraemaeker. Motivations. To be able to predict the closed-loop performance for collocated systems Important for structures not tested on ground (satellites …). Principle of collocated control.

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Cassem meeting eads paris
CASSEM meeting – EADS Paris

Active Structures Laboratorywww.ulb.ac.be/scmero

Arnaud Deraemaeker


Motivations
Motivations

  • To be able to predict the closed-loop performance for collocated systems

  • Important for structures not tested on ground (satellites …)


Principle of collocated control
Principle of collocated control

  • Unconditional stability

  • Performance = distance pole-zeros of open-loop transfer function

  • Zeros are the most difficult to predict (very sensitive to local strain distribution for piezo patches)


Available test structures
Available test structures

  • Composite plate with piezo ceramics (d31-d32)

  • Composite plate with macro fiber composites (MFC)

  • Boom with MFC


= 0

Piezo patch

Base plate

Test structure 1

Actuator


(sensor)

(sensor)

(sensor)

Experimental / numerical results

Experimental FRF between p1 and pi

Numerical FRF between p1 and pi







Crucial points for the modeling of collocated piezo systems
Crucial points for the modeling of collocated piezo systems

  • Composite material properties play an important role on the poles of the structure

  • Actuator properties (d31, d32 as well as mechanical) play an important role on the zeros

  • Modeling of excentricity (mid-plane) is important for the modeling of the zeros


What is needed
What is needed ?

  • Mechanical properties of composite

  • Mechanical / electrical properties of PZT patches

  • Mechanical / electrical homogeneized properties of the MFCs : this is a difficult problem !

  • Can you provide this information ?


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